Hatch-cover



K. KNUTSON.

HATCH COVER.

APPLICATION FILED FEB. II, 1919.

` Patented Sept. 7, 1920.

FMH.

FIG. 3.

FI G. 5.

FI G. 7

HATCH-COVER. i

To all whom may concern.' f Y Be it `known that l, KNUT KNUTsoN, a subject ot the King of Norway, residing lat Bergen, Norway, have invented certain new l' and useful Improvements in Hatch-Covers;

and l do hereby declare the following to be a full, clear, and exact description, ofthe invention, such as will enableothers'skilled in theart to which it appertains to make vand use the same, reference 1being had ,to the accoifnpanying drawings, and toV letters or y figures of reference marked thereon,y which form a part of this specification;

My invention relates to hatches for use in ships, lighters and the like, as well asfor use in industrial plants, and maybe considered as a further development ofmy U. S, Patent No. 948733 on an improved double corrugated sheet iron, and my British Patent No. 26511 of 1910on a multiple sheet iron. According to my invention l adapt .the principle known from `the said patents to the construction of hatchy covers of corrugated plates of heavy sheet irfon. l

In the following4 the invention shall-be fully explained, reference being 'had to the accompanying drawings Vin which Figures l and 2 are diagrams illustrating the transformation of the'corrugations or waves of an ordinary corrugated sheet iron into double and triple corrugations respectively, and Figs. 3 and 4c are diagrammatic cross sectional views of hatches vwith double corrugated sheet iron covers and triple sheet iron covers respectively. Fig. 5 isy a plan view of a hatch coaming. Fig. 6 across sectional diagram on lineV a- Fig. 5, and Fig. 7 is a cross sectional view oi':' a modified form of a hatch cover and coarning. Fig. 8 illustrates a detail. y p

The diagram Fig. 1V illustrates the transformation o'f the corrugations or waves 1, 1 of an ordinary corrugated sheet (these Waves being shaded in the diagram), into a 45 double corrugation or wave forming a wave line 2, 3, 4c, 3, 2, and inthe diagram Fig. 2 is illustrated a corresponding trans-L formation ci: three ordinary corrugations or waves 1, 1, 1, into a triple corrugation or wave line 2, 3, 4l, 5, 4, 3,2; the lines @/-g/ representing the axis of` gravity of the profiles. It will be seen that compared with the ordinary Waves 1, 1 these double and triple cross sections have, in accordance with the above mentioned patents, without any increase of length, cross sec-tional area Specification ofLetteis Patent.

original corrugated forni. These double and triple sec-tion forms as 'KNUT KNUTsoN, or sensitiv,yiiorra'ar.-.Y.iA .f

rateale-eri sept. "7, ieao. applicati@ flied February 11,'1'919. seria'i no. 276,372. f Y' explained in the above mentioned patentsL 1 have a considerably larger bearing strength orinoment oit' resistancel than the-corrugaf'` 'tioiis'1, het an ordinary corrugated sheet iron. An exact calculation shows that V'the Vtransforma'tion of ,two original corruga-V tions into one double corrugation or wave does not increase the weight but increases the bearing strength about 55%, and that.A

the transformation of three original coryrugations into a tripleV corrugation wavev increases the bearing Astrength about 110%. Compared with the corrugation vforms known from theipatents-before mentioned vthe present orinfin order to be adapted forv its novel use has been considerably inodiiied,

the vcorrugations not having va lgreater height than'width, but on'thc contrary a consid'- erably greater width than height, 'whereby a flattened rooflikeor vaultlike orin of the Wave is obtained, retaining, however, at the saine time the longitudinal stiilness of the corrugations. Vhile the old double and multiple corrugated sheet iron had it`s`principal strength in the longitudinaldirection the present modified form has as wellfa con siderable strength in planes atfright angles to the corrugations. y v Y Hatches oi this corrugation or wave type may be made otone piece of rolled plate or if the width of the plate' is insuilicieiit hereto, be composed ot two or more interconnected plates. Y i" In a corresponding way hatches alsomay be made of lates havin@` uadrn le /l l n 'fquintal" and sextal corrugations .or waves of thesame cross sectional area and weight as their respective original `toi-ms, from which they inay'always be considered to be raised.

In Fig. 3 is shown a hatch forminga free carrying beam resting at the diate su Dort and havinffalonfr lo'nituf i A D o t1v r coverr6made of a double corrugatedplate, said plate n dinal edgesahoriZontal traine et U-iron 8,.;AJ

in direct contact,u itlithe. upper faceV 'of the coaming9. Y Fig. l illustrates similar hatch cover diliiering'only from that shown in Fig.' 3

therein that the cover 6 is-triply corrngated.

In hatches of large dimensions it will be necessary to use beams (see Figs. 5 and 6) supporting the.' curve vof transition be-V Y tweenV theindividual waves, and transversal.

llO

stays v11 '(.indicated with broken lines in V Figs. 5 and 6) as well as diagonal stays l2.

rEhese stays as well asa transverse .support orwall 13 in the middle part of the hatch cover Q serve'as supports or stays for the hatch cover, when this is swung up on hinges (not shown) suoli hinges being preferably arranged along its side for instance one in the middle fand one at each end.V

i Owing to their light construction thel hatch covers may'without diiliculty be vswung on hinges. l Y n The hatch cover' end walls 7 are supported by angle iron 14; of the coaming-Q which may be arranged horizontal as shown in Figs.' t to 6, or the Aend 'walls maybe curved as shown by 15 on Fig. 7. 'In this latter case the Ylower edges of the end walls of the hatch covers are curved correspond- Vingly whereby the rweight oA the hatch cover is reduced. p y Y Y Y As shown in Fig. 8 the space between the edge frame of the hatch cover Vand the coaming may suitably be made so wide as to give room for a packing 16 of felt, sail cloth, wooden laths or any other material fit for making a watertight joint, the edge '17 oi thecoaming projecting .above the anvresistance compared with its cross sectional area, thereby enabling using lighter hatches than heretofore. Y

Claims.

l. A hatch cover comprising a hatch vcover frame `for connection with a hatch coaming and a corrugated plate secured to said cover frame and extending from side to side of said frame arch-shaped in section and the corrugations arranged transversely of the arch.

2. A hatchv cover comprising a hatch cover frame for connection with a hat-ch coaming, vand a longitudinallyV corrugated transverselyVY arched single thickness plate ksecured* to said cover' frame and forming its l top and having a central corrugation at its crown.

3. VA hatch cover comprisingv a vhatch cover frame for connection with a hatch Vparallel side corrugations on the side portions of said arch. v f

4. A hatch cover comprising a hatch cover frame. for connection with a Vhatch coaming, and an arch-shaped roof` secured. to said frame having-a central c'orrugation at its lcrown vandfparallel, lateral corrugations, the height of said roof` being a multiple Vof' the height roi' each corrugation and peach corrugation beingof' less height than width. y 5. A hatchA cover comprisingV a jhatch cover frame to besecuredto a coaming, and an arched roof'secured to said frame having a plurality of corrugations curved in cross-section and odd in number, there be-l ing a singleY corrugation at the middle, ther height ofthe cover being a multiple of fthe height of each corrugation and the height' of each corrugationbeing less than its width, all of saidY corrugations combinn ing toV actas a single beam.

` 6. A hatch coverr comprising Va hatch cover frame having end plates curved on vtheir lower edges, said cover adapted to `fit a complementary` shaped coaming, an arched corrugated sheet metal roof secured to said frame the height of the arch` being a multiple 01"' the height of each corruga- Vroof secured to said frame, the corrugations being curved in cross-section', and members on said frame supporting the rooi iiiterme- .diateitscsides'at the transitioncurves connecting adj acentccorrugations.

hatch cover comprising aV hatch iio vIn testimony. that I claim'the foregoing as my invention, I have signed my name in presence of two subscribing' witnesses.

f Y y p KNUT` KNUTSON. WVitnesses: y. i

W. HAKSEN, JOHN KUAMME. 

